A bottle of saturated salt water, a bottle of distilled water, the following identification methods

12345 is all right.

There are two bottles of out-of-label reagents in the laboratory, one of which is saturated saline and one is distilled water, and there are several kinds of identification, as follows:

1. Taste, salty is saturated salt water, tasteless is distilled water;

2. Take a small amount of each drop and add it dropwise, there is white precipitate is salt water, and salt dissolved is distilled water;

3. Take a small amount of each and heat it in the evaporation dish, and the crystals that precipitate out are salt water, and none are distilled water;

4. Put the radish strips into the two liquids and take them out after a period of time, and the radish strips become soft with salt water;

5. Measure the density of two liquids, the denser is salt water, and the smaller is distilled water;

6. Using the different density of the solution, if the eggs are immersed to see the sinking and floating situation, the eggs floating on the liquid surface are saturated salt water, and the eggs sinking under the liquid surface are distilled water;

7. Use the conductivity device of the solution to measure their conductivity to see if the bulb is bright, and the bulb is bright with sodium chloride solution;

8. Add a small amount of agno3 solution to see if there is a white precipitate, and the precipitate is sodium chloride solution Remember these methods and compare the questions to get the answer!

1 is correct. Saturated salt water is not allowed to dissolve salt.

2.is wrong, the volume is the same size.

3.is wrong and cannot be used to try the taste.

Physical Methods:1Salt water is salty and distilled water is light (sensory)2Saturated salt water is so dense that floating eggs are fine.

3.Saturated salt water has a lower freezing point than distilled water and freezes (freezes)4Crystallization occurs in evaporated salt water, but not in distilled water.

Chemical Methods:1With the addition of silver nitrate, salt water will precipitate, while distilled water will not.

Heated with an alcohol lamp, it is distilled water that is completely evaporated, while seawater is produced from salt grains. Conclusion: Distilled water is pure, seawater is a mixture.

Distillation, there will be salt particles after the salt water is distilled.

The solution is to be steamed, and the spine is spine, and the jujube is x.

200--x）*8%=100*5%

200-x =5/8%x =

A glass of 125g of water. After adding 25g of salt, the salt content of the equipment water is about 100.

25 (25+125) 100%=1 6 100% about the same hole, I hope the above content can help you with Nabi, dear

Salt mass: 100 4% = 4 (grams) punch brother such as.

The quality of the brine after partial water evaporation:

4 5% = 80 (dust socks grams), the mass of evaporated water: 100-80 = 20 (grams); Scatter.

A: 20 grams of water has been evaporated

So the answer is: 20

It's all right, just 3 can't taste in the lab and you can at home.

1 is correct. Saturated salt water is not allowed to dissolve salt.

2.is wrong, the volume is the same size.

3.is wrong and cannot be used to try the taste.

If you are already confusing only these two categories, you can do the above.

Mixed with others is not good.

3 Probably not, because it is never tasted in the laboratory... Others can.

145 True: If there is less salt, 2 is not obvious, 3 generally cannot be tasted in the laboratory.

A: The solution is thinned wrong, the solution is still saturated, if 10ml of water is proposed, there will be salt crystallization, the solution is still saturated, if 10ml of solution is proposed, of course the solution is still saturated.

B: The solution changes from saturated to unsaturated Wrong, the solution is still a saturated solution.

C: Still saturated solution correct.

d: None of the above is correct False.

Hope it helps.

C: Still saturated solution.

Because even if 10ml of saturated salt water is proposed, it is still a salt solution, and the solution has uniform and stable characteristics.

Type 1: 1A small sample is placed in a test tube.

2.Silver nitrate was added dropwise separately to observe the phenomenon.

Conclusion: If white precipitate is produced, it is salt water; If there is no phenomenon, it is distilled water.

The second: 1Take an appropriate amount of sample and place it in an evaporation dish.

2.Evaporation crystallization.

Conclusion: If there are white crystals digging with ears, it is salt water; If there are no white crystals, it is distilled water.

The third type: 1Take an appropriate amount of sample and put it in the electrolytic cell.

2.Anodic release the moistened starch potassium iodide test strip, and observe the phenomenon after a period of time.

Conclusion: If the starch potassium iodide test paper turns blue, it is salt water; If there is no phenomenon in the clan, it is distilled water.